New date/time integration for cl-postgres

[Attila Lendvai]

> https://www.postgresql.org/docs/current/datatype-datetime.html
>
> Given this, I feel that local-time:timestamp is a perfect fit for timestamptz.

oh, hrm. maybe i just shouldn't try to play smart from a decade old memory... :)

sorry for the noise,

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• attila lendvai
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